It's a peculiar thing, familiarity. For one, it let's you think you know a person. And, should you like that person, it gives wings to you imagination. That, in particular, is a dangerous thing.
It is dangerous because what we concoct in the mind is seldom a representation of reality, which can become a disaster in the making.
But I am still a proponent of it. In the sense that it is an indulgence which is desirable. For there is always beauty in the imagination of a romantic. That, if understood and enjoyed, knowing the pitfalls, can be a marvelous experience. Just as drugs are.
Do that, or do drugs. Your pick.